TGK SPECIAL STEEL PVT. LTD. - HANDBOOK

The Name You Can Trust www.tgkssl.com - 41 - Descriptions and data in the file are typical cases. We will not make guarantee for them. Besides, we reserve the final right to interpret improvement in materials, quality and/or performance. Steel Grade (TPM6711) PRODUCTION DESCRIPTION TPM6711 has small carbide particles and uniform distribution, which is a good substrate for PVD and CVD. Applications: end milling, bearing and other parts, broach, tap, cold working tools, drill, etc. PURITY Type A Type B Type C Type D 1.3 4.10 6.40 5.00 Thin Thick Thick Thin Thin Thick Thin Thick 0 0 1.0 0.5 1.0 0.5 1.0 0.5 PHYSICAL PROPERTIES 3 1. Density (p) : 8.1g/cm 2 2. Modulus of Electricity (E)KN/mm o Temperature/ C 25 400 600 E 250 222 200 o Temperature/ C 25 400 600 24 28 27 3. Thermal Conductivity o Temperature/ C 25 400 600 10 10.6 11.1 4. Thermal Expansions o Temperature/ C 25 400 600 420 510 600 o 5. Specific Heat (c) J/KG. C) C SOFT ANNEALING Soft annealing in a protective atmosphere o o at 860 C~900 C for 3~5h, followed by o o slow cooling at 10 C/h down to 500 C , then air cooling. CHEMICAL COMPOSITION C Cr W Mo V 2.30 4.2 7.0 6.5 6.5 Co 10.5 SIZE SUPPLIED Product Round (mm) Wire Rolled Forged 3.2~300 Plate (mm) 255 x 510 DELIVERY CONDITION Typical soft annealed hardness is under 340HB. MICROSTRUCTURE 1. The carbides are fine and distribution; the carbide size is 5um (The average of size of 3 grain large carbides under 10 fields of view under 1000X, the maximum value is not greater than 5um). 2. The inhomogeneity of eutectic carbide is not more than grade 1. ULTRASONIC INSPECTION According to SEP1921- E/e standard According to GB/T6402-2008 standard grade 4 According to customer requirements POWDER METALLURGY